CN105036773B - Ladle bottom castable - Google Patents
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Abstract
The ladle bottom castable is a bulk refractory material prepared by mixing corundum, fused magnesia-alumina spinel, alpha-type activated alumina and magnesite powder with different particle sizes, fine powder and micro powder according to a certain proportion, adding various additives, taking aluminate cement as a bonding agent, uniformly stirring and mixing, wherein the weight percentages of the components are as follows: 10-30% of 25 mm-10 mm corundum, 5-15% of 10 mm-8 mm corundum, 5-15% of 8 mm-5 mm corundum, 5-15% of 5 mm-3 mm corundum, 15-25% of 3 mm-1 mm corundum, 15-25% of 1 mm-0 mm corundum, 5-20% of 0.074 mm-0 mm fused magnesia alumina spinel, 1-15% of 0.061 mm-0 mm magnesia powder, 5-20% of 0.045 mm-0 mm corundum micropowder or silicon micropowder, 2-20% of alpha type activated alumina, 2-15% of calcium aluminate cement, 0.1-1.5% of water reducer and 0.01-1% of explosion-proof fiber. The invention has high refractoriness, excellent thermal shock resistance, erosion resistance and physical properties.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a refractory castable for a bottom of a steel-making ladle.
Background
Since the 21 st century, the steel industry in China has been developed at a high speed, and meanwhile, remarkable achievements are achieved in various aspects of new steel product development, production flow optimization, compactness, high efficiency, energy conservation, consumption reduction, environmental management and the like. Under the drive of development requirements in the fields of aerospace, war industry, machinery, chemical industry and the like, steel grades with high cleanness, high uniformity, low carbon property, ultrafine crystal and the like are developed on the basis of optimization of the existing production equipment in steel smelting.
In a steel smelting system, a steel ladle occupies a very important position, the service life of the steel ladle directly determines the smelting efficiency, the refractory material of a working layer of the steel ladle influences the quality of smelting steel varieties, and along with the continuous improvement of external furnace refining technology, the variety of the variety steel is greatly increased, the requirement of the production of high-quality steel on the cleanliness of molten steel is more and more strict, so the service environment of the steel ladle is more and more severe, and the requirement on the refractory material for the steel ladle is more and more high. Under the requirement of improving the quality of molten steel, the refractory material of the ladle working layer is gradually changed from carbon-containing to carbon-free and from shaping to unshaped. In the aspects of economy, labor saving, environment and the like, the pouring construction becomes an effective method for ladle construction, the development of the pouring material for the ladle is promoted by various advantages of the pouring construction, and the refractory material for the ladle working layer is developed to be completely amorphous at present.
The refractory material for the steel ladle is divided into a heat insulation layer, a permanent layer and a working lining from outside to inside. The furnace age of the ladle depends on the service life of the working lining, the clay brick and the high-alumina brick are mainly used as the working lining of the ladle in China in 50-70 years, and the aluminum-magnesium ramming material, the aluminum-magnesium castable, the aluminum-magnesium unburned brick, the aluminum-magnesium spinel, the aluminum-magnesium (carbon) castable, the aluminum-magnesium carbon brick, the aluminum-magnesium spinel carbon brick, the aluminum-magnesium high-grade unburned brick, the high-grade aluminum-magnesium (spinel) castable, the magnesia carbon brick, the low-carbon magnesia carbon brick, the dolomite ramming material, the unburned magnesia calcium brick, the unburned magnesia calcium carbon brick, the zirconium brick and the like are mainly used in 80 years. At present, magnesia carbon bricks, alumina-magnesia carbon bricks, corundum spinel castable and castable precast blocks are mainly used as main refractory materials.
The ladle working layer mainly comprises a ladle bottom, a ladle wall and a slag line. Carbon-containing refractory materials are still used in the slag line section today because of their obvious characteristics of excellent erosion resistance. The wall part can be made of precast blocks of casting material and spinel casting material through research and development, but has the defects of limited service life, high cost and the like. The ladle bottom castable has slower development, and although the castable is also used for unshaped refractory materials such as spinel castable and the like, the problems of unsatisfactory service life and high cost still exist. In order to better serve the steelmaking industry, prolong the service life of the ladle and stabilize the quality of molten steel, the development of a ladle bottom castable with long service life and high performance has important significance and necessity.
The invention aims to develop a castable for a steel-making ladle bottom, which is a refractory material with high refractoriness, thermal shock resistance, erosion resistance and excellent physical properties. The defects that the quality of molten steel is polluted by carbon-containing and shaped refractory materials at the bottom of the steel ladle, the service life is short, and the smelting of special steel types cannot be met can be overcome, and the good using effect of prolonging the service life of the steel ladle and improving the quality of the molten steel can be achieved by replacing the existing products.
The technical scheme is as follows:
the ladle bottom castable is a bulk refractory material prepared by mixing corundum, fused magnesia-alumina spinel, alpha-type activated alumina and magnesite powder with different particle sizes, fine powder and micro powder according to a certain proportion, adding various additives and taking aluminate cement as a bonding agent, and uniformly stirring and mixing. Wherein the weight percentages of the components are (commercial products):
10 to 30 percent of corundum with the granularity of 25 to 10mm,
5-15% of corundum with the granularity of 10-8 mm,
5-15% of corundum with the granularity of 8-5 mm,
5-15% of corundum with granularity of 5-3 mm,
15-25% of corundum with granularity of 3-1 mm,
15 to 25 percent of corundum with the granularity of 1 to 0mm,
5 to 20 percent of fused magnesia-alumina spinel with the fine powder of 0.074 to 0mm,
1 to 15 percent of magnesia powder with 0.061mm to 0mm of fine powder,
0.045 mm-0 mm corundum micropowder or 5-20% silicon micropowder,
2-20% of alpha type activated alumina,
2 to 15 percent of calcium aluminate cement,
0.1 to 1.5 percent of water reducing agent,
0.01-1% of explosion-proof fiber.
The corundum is brown corundum, white corundum or tabular corundum, wherein Al is2O3Content (wt.)>95 percent; the corundum micropowder is of grain diameter<45um，Al2O3Content (wt.)>99%。
The fused magnesia-alumina spinel is rich in magnesium and has MgO content>70% of aluminum-rich spinel, Al2O3Content (wt.)>70%。
The magnesite powder is fused magnesite powder with MgO content>98%，SiO2Content (wt.)<0.2%, CaO content<0.5%。
The silicon micropowder has a particle diameter<45um ，SiO2Content (wt.)>97%。
The activated alumina is alpha-type activated alumina.
The calcium aluminate cement is calcium aluminate CA70 or CA80 cement.
The water reducing agent is carboxylate water reducing agent ADW, ADS or FS 20.
The explosion-proof fiber has an equivalent diameter of 15-45um and a length of 0.4-0.8 mm.
The innovation points of the invention are as follows:
1. the ladle bottom castable is a carbon-free refractory material, and does not carburete molten steel, so that the quality of the molten steel is reduced.
2. The ladle bottom castable is an unshaped refractory material, is simple to construct, and has excellent physical and chemical properties due to the selection of reasonable raw material types and particle-level ingredients.
3. The ladle bottom castable has better service performance and longer service life than the conventional shaped refractory product.
4. The physical and chemical indexes of the ladle bottom castable are as follows:
the invention relates to the technical field of steel industry and refractory material industry, and mainly belongs to a refractory castable for a bottom of a steel-making ladle. The castable is developed mainly for solving the defects that the conventional carbon-containing and shaped refractory material for the ladle bottom pollutes the quality of molten steel, has short service life and cannot meet the smelting requirement of special steel. Meanwhile, the product provides powerful guarantee for steel making safety of the steel ladle through use, and promotes development of refractory material products and technologies. As the ladle bottom castable provided by the invention is mature in raw material selection and construction technology, the popularization and the use of the castable are very easy, and the castable has great value and significance.
Detailed Description
Example 1
The ladle bottom castable is a bulk refractory material prepared by mixing corundum, fused magnesia-alumina spinel, alpha-type activated alumina and magnesite powder with different particle sizes, fine powder and micro powder according to a certain proportion, adding various additives and taking aluminate cement as a bonding agent, and uniformly stirring and mixing. Wherein the weight percentages of the components are as follows:
15 percent of corundum with the granularity of 25 mm-10 mm,
8 percent of corundum with the granularity of 10 mm-8 mm,
8 percent of corundum with the granularity of 8 mm-5 mm,
8 percent of corundum with granularity of 5 mm-3 mm,
18 percent of corundum with the granularity of 3 mm-1 mm,
16.48 percent of corundum with the granularity of 1 mm-0 mm,
7 percent of fused magnesia-alumina spinel with the fine powder of 0.074 mm-0 mm,
7 percent of magnesia powder with 0.061 mm-0 mm of fine powder,
0.045 mm-0 mm corundum micropowder or 5% silicon micropowder,
alpha type activated alumina 3%
3 percent of calcium aluminate cement,
1.5 percent of water reducing agent,
0.02 percent of explosion-proof fiber.
Selecting raw materials:
corundum: comprises brown corundum, white corundum and tabular corundum, wherein Al2O3Content (wt.)>95%。
Fused magnesia-alumina spinel, magnesium-rich spinel, MgO content>70% of aluminum-rich spinel, Al2O3Content (wt.)>70%。
Magnesia powder: selecting fused magnesia powder with MgO content>98%，SiO2Content (wt.)<0.2%, CaO content<0.5%。
Corundum micropowder: particle size<45um，Al2O3Content (wt.)>99%。
Silicon micropowder: particle size<45um ，SiO2Content (wt.)>97%。
Activated alumina: alpha type activated alumina is selected.
Calcium aluminate cement: calcium aluminate CA70 or CA80 cement was used.
Water reducing agent: adopting carboxylate water reducing agent ADW, ADS or FS20 water reducing agent.
Explosion-proof fiber: equivalent diameter of 15-45um and length of 0.4-0.8mm
Weighing:
the percentage of each raw material is determined according to the formula as required. Weighing the required amount of each raw material according to the percentage content and the total amount of the ingredients, and weighing the weighed raw materials to be mixed.
Mixing materials:
and (3) pouring the weighed particles in the raw materials into a mixer, mixing for more than 3 minutes, then pouring the weighed fine powder, mixing for more than 5 minutes, discharging, filling into a ton bag, and finishing packaging.
Construction:
pouring the ladle bottom castable into a stirrer, stirring for more than 1min, adding water according to 4-5% of the weight of the castable, stirring for 8min, discharging, putting the castable into a ladle bottom, spreading uniformly, and then vibrating for forming.
Examples 2 and 3 are similar to example 1 except that the weight percentages of the components are different, as shown in the following table:
| example 1 | Example 2 | Example 3 | |
| Corundum with thickness of 25 mm-10 mm | 15% | 20% | 25% |
| Corundum of 10 mm-8 mm | 8% | 6% | 5% |
| Corundum 8 mm-5 mm | 8% | 6% | 5% |
| Corundum of 5 mm-3 mm | 8% | 6% | 5% |
| Corundum 3 mm-1 mm | 18% | 16% | 15% |
| Corundum of 1 mm-0 mm | 16.48% | 16% | 15% |
| 0.074 mm-0 mm electric melting magnesia-alumina spinel | 7% | 6% | 5% |
| 0.061 mm-0 mm magnesite powder | 7% | 6% | 5% |
| 0.045 mm-0 mm corundum micropowder or silicon micropowder | 5% | 7.2% | 9.45% |
| Alpha type activated alumina | 3% | 6% | 5% |
| Calcium aluminate cement | 3% | 3% | 5% |
| Water reducing agent | 1.5% | 1% | 0.5% |
| Explosion-proof fiber | 0.02% | 0.8% | 0.05% |
The total content of the raw materials is 100 percent and 100 percent.
Claims (8)
1. The ladle bottom castable is a bulk refractory material prepared by mixing corundum, fused magnesia-alumina spinel, alpha type activated alumina and magnesite powder with different particle sizes, fine powder and micro powder according to a certain proportion, adding various additives and taking aluminate cement as a bonding agent, and uniformly stirring and mixing, and is characterized in that: wherein the weight percentages of the components are as follows:
10 to 30 percent of corundum with the granularity of 25 to 10mm,
5-15% of corundum with the granularity of 10-8 mm,
5-15% of corundum with the granularity of 8-5 mm,
5-15% of corundum with granularity of 5-3 mm,
15-25% of corundum with granularity of 3-1 mm,
15 to 25 percent of corundum with the granularity of 1 to 0mm,
5 to 20 percent of fused magnesia-alumina spinel with the fine powder of 0.074 to 0mm,
1 to 15 percent of magnesia powder with 0.061mm to 0mm of fine powder,
0.045 mm-0 mm corundum micropowder or 5-20% silicon micropowder,
2-20% of alpha type active aluminum oxide
2 to 15 percent of calcium aluminate cement,
0.1 to 1.5 percent of water reducing agent,
0.01-1% of explosion-proof fiber.
2. The ladle bottom castable according to claim 1, characterized in that the corundum is brown corundum, white corundum and tabular corundum, wherein Al is2O3Content (wt.)>95 percent; the corundum micropowder is of grain diameter<45um，Al2O3Content (wt.)>99%。
3. The ladle bottom castable of claim 1, wherein the fused magnesia alumina spinel is rich magnesium spinel, and has MgO content>70% of aluminum-rich spinel, Al2O3Content (wt.)>70%。
4. The ladle bottom castable according to claim 1, wherein the magnesite powder is fused magnesite powder, and the MgO content is>98%，SiO2Content (wt.)<0.2%, CaO content<0.5%。
5. The ladle bottom castable according to claim 1, wherein the silica micropowder has a particle size<45um ，SiO2Content (wt.)>97%。
6. The ladle bottom castable according to claim 1, characterized in that the calcium aluminate cement is calcium aluminate CA70 or CA80 cement.
7. The ladle bottom castable according to claim 1, characterized in that the water reducing agent is carboxylate water reducing agent ADW, ADS or FS 20.
8. The ladle bottom castable according to claim 1, wherein the explosion-proof fiber has an equivalent diameter of 15-45um and a length of 0.4-0.8 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510464567.9A CN105036773B (en) | 2015-08-03 | 2015-08-03 | Ladle bottom castable |
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| CN201510464567.9A CN105036773B (en) | 2015-08-03 | 2015-08-03 | Ladle bottom castable |
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| CN105036773B true CN105036773B (en) | 2020-04-07 |
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| CN105439586A (en) * | 2015-12-02 | 2016-03-30 | 武汉如星科技有限公司 | Castable for large steel ladle |
| CN106083110B (en) * | 2016-08-19 | 2018-09-18 | 郑州市瑞沃耐火材料有限公司 | High strength steel ladle-lining castable |
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| CN107244904A (en) * | 2017-07-13 | 2017-10-13 | 华北理工大学 | A kind of corundum spinel castable and preparation method thereof |
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| CN115893997A (en) * | 2022-10-18 | 2023-04-04 | 鞍山市和丰耐火材料有限公司 | Erosion-resistant and impact-resistant ladle working layer castable and preparation method thereof |
| CN115893995A (en) * | 2022-12-06 | 2023-04-04 | 郑州银河耐火材料有限公司 | Efficient anti-erosion steel ladle gunning material and preparation method thereof |
| CN116396063B (en) * | 2023-03-27 | 2024-02-27 | 宜兴金君耐火炉料有限公司 | 99 castable for resisting copper liquid erosion and peeling in low-oxygen copper rod production |
| CN116143528A (en) * | 2023-04-20 | 2023-05-23 | 淄博雷法耐火材料有限公司 | Refractory material binding agent and application method thereof |
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| US20100210444A1 (en) * | 2009-02-19 | 2010-08-19 | Rhoads Randy L | Large refractory article and method for making |
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